1231455324321 has 48 divisors (see below), whose sum is σ = 1851737659200. Its totient is φ = 787961706624.

The previous prime is 1231455324317. The next prime is 1231455324349. The reversal of 1231455324321 is 1234235541321.

1231455324321 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 4 + 5 + 5 + 324 + 321 = 666.

It is not a de Polignac number, because 1231455324321 - 2² = 1231455324317 is a prime.

It is a super-2 number, since 2×1231455324321² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231455324301) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8164690 + ... + 8314148.

It is an arithmetic number, because the mean of its divisors is an integer number (38577867900).

Almost surely, 2^{1231455324321} is an apocalyptic number.

It is an amenable number.

1231455324321 is a deficient number, since it is larger than the sum of its proper divisors (620282334879).

1231455324321 is a wasteful number, since it uses less digits than its factorization.

1231455324321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149838 (or 149835 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The spelling of 1231455324321 in words is "one trillion, two hundred thirty-one billion, four hundred fifty-five million, three hundred twenty-four thousand, three hundred twenty-one".